Abstract
First results concerning p -p and n -p annihilation cross section and n -p total cross sections at low energies ( 2.25 ≤ E P ≤ 22.76 MeV and 3.4 < E n < 44.6 MeV ) obtained by the OBELIX spectrometer are reported. The agreement with the few existing data in this energy range is good; the comparison with some models gives interesting indications on the S and P wave contribution at very low energy and on the range of the elastic interaction.
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